Antireverse latch



Jan. 6, 193.1. 1,7";633

ANTIREVERSE LATCH (AN mrnovmmm FOR 1m (ms mums) s. KUWADA 2 Sheets-Sheet 1 Filed April 3, 1928 1 NVENTOR OWMIM 1 ATTORNEYS G. KUWADA.

Jan. 6 1931.

ANTIREVERSE LATCH (AN IMPROVEMENT FOR DRY GAS IBTBRS) Filed April 3. 1928 2 Shoots-Sheet 2 mvamog BY (P Q W ATTORNEYS Patented Jan. 6, 1931 meters G-OMZPEI KUWADA, or KOMEDANLM-URA, nawhnn-eungmran ANTIREVERSE LATCH (AN IMPROVEMENTYEORQRYGAS-METERS) Application filed April 3, 1928, Serial Nor-rgfiflflg-l and in g Jfapanaphi s, 1927.

My invention relates to an improvement on the mechanism of dry gas meters, 1n particular to a latch for preventing reverse moy tion of meters mechanism not only in its upright normal position but also at anyvinclined position.

In any meter known heretofore there is provided certain forms of latches but they are found that when a meter is held at an inclined position either to right or to left,

such latches tip to such a position as to alw the revolving mechanism of meters to run in reverse direction when gas is admitted from the outlet or when any force on gaseous medium is applied reverse to the normal direction of passage.

When this reverse, motion is set up and allowed to continue, it not only reverses the v D evel -ves n it norma lme i igh t left 1n Flg. (1) the latch2 f reely yieldsto registration of gas already passed but in ad- 29 dition allows gas to pass through the meter free of registration in quantity equivalent to the amount by which the past registration My invention provides a latch which stops $15 the revolving mechanism of a meter when it starts to run in reverse direction in whatever inclined position a meter may be held when it may happen that gas is made to pass through it in reverse direction.

My invention is illustrated by accompanying drawings, in which, Fig. (l) is a side elevation of the partof a dry gas meter that has to do with my invention, the meter being held in its normal position, Fig. (2) a plan 3:3 view of the same, Fig. (3) a side view of a meter inclined to one side; Fig; (4) the same as Fig. (1) but inclined to one side to such an extent that with the latch known heretofore reverse motion is not stopped but with to provision of my invention reverse motion is positively stopped.

In these views 1, represents a usual form of latch heretofore known which when a meter is held in an inclined position such as Figs.

4a (3) and (4;) tips to such a position as to allow the revolving mechanism of a meter to run in reverse direction, 2 represents a latch according to my invention of which the centre of gravity is situated in such relation to the point of suspension that at whatever inclined he .tier e iet rmei b h e1,:th l t ee 5 rete niin such, apeeiti a t p s st r any revers mean, of a .m t 'rive in inieeheniemt nepresel t th pe tpteeep nei l t .l ch Ie my i v tions-tith b a ke en h e et h? strikes whe h t ge t 1 mounted on the shaft 6 is forced to revolve fin-rever reetienrepresent th ntr o r te...2- o

.11 expla nin t rking of my i ven- .011. I i i .E et, w en a meteri Sup-p t horizonthe-jlatch 2. 1 account of its centre I of grav ty 7 an I t 1 support ffor ed by the .btaeke ea in Ei-g- --('l.) m nt n its '1 P- ht ,p os tron andflwhen thetangent arm 5 on si and al ow -th .ee ftees e rm to pass unchecked.

when the tangem arm is made to revolve in a reverse direction and strikes against the finger of the latch 2 the lower gravity of the v portion of the latch touches the bracket 4 and the reverse motion is stopped. Second, when a meter is removed from its connecting unions 8 and 9 Fig. (3) and the inlet and the outlet of a meter are connected up to the outlet and inlet pipes vice versa and a meter is heldin an inclined position such as in Figs. (4),, as the centre of gravity 7 of the latch 2 is located below the axis of suspension 3' the finger of the latch 2 maintains a position normal to the path of the revolving tangent arm. Thus when the tangent arm revolves in its normal direction the latch 2 freely yields to one side and allows the tangent arm to pass unchecked and as soon as the tangent arm is passed the latch returns to its former position. But when the tangent arm is made to revolve in a reverse direction and strikes against the finger of the latch 2 the lower portion of the latch touches the bracket 4 and the reverse motion is checked.

In this manner even when purposely or otherwise a meter is supported in an inclined position and made to run in a reverse direction, with the provision of my invention it will be positively impossible to run it backward, a feature entirely new and of great imfirovement for dry'gas meters.

7 aving thus described my invention What I claim is:

1. In a dry gas meter having a metering mechanism including a revolving tangent arm, a pivoted latch member having a projecting finger adapted to be engaged by said tangent arm, said latch member being of such formvtha-tthe center of gravity thereof is located on a line passing through the pivot point perpendicularly to the longitudinal" axis of the latch finger, and is spaced from v the pivot point a distance such that the moment of the latch member about the pivot point causes the latch member to assume a position wherein the longitudinal axis of the latch finger is perpendicular to the plane of the path of said engaging mechanism, even though the meter is tilted into an inclined position.

2. In a gas meter having a metering mechanism including a revolving tangent arm, a support, a latch member pivoted to said support, said latch member including a projecting finger lying in the path of movement of the revolving tangent arm, the centerv of gravity of the latch member being'fsorelated to the pivotal point that the projection finger of the latch prevents reverse movement of the revolving tangent arm in allinclined positions of the meter betvveen 0 and- 90 to the horizontal.

In testimony whereof I have attired my signature.

' GOMPEI KUWADA. 

